Percussive tool



July 2, 1929.

F. M. SLATER P RcUsKuvE TOOL gr %I INVENTOR.

Fz'e M13710! 42 HIS AT RNEY Patented July 2, 1929.

UNITED STATES 1,719,143 rarer orrijcs.

FRED M. SLATER, or EASTON, PENNSYLVANIA, 'assienon T0 monasoLL-ieann c MPANY, or JERSEY CITY, NEW JERSEY, A oonroaa'rron on NEWIJERSEY.

PERCUSSIVE TOOL.

Application filed May 2, 1927. Serial No. $8,202.

This invention relates to fluid actuated percussive tools, but moreparticularly to throttle valves and their controlling means for tools ofthis type. r

The objects of the invention are to simplify and lighten theconstruction of tools of this type and to enable the admission ofpressure fluid into the tool to be controlled by pressure ordinarilyapplied to the handle for holding the said tool to the work.

Other objects will appear hereinafter and to all of these ends theinvention consists of the combination of elements and arrangement ofparts having the general modeof operation substantially as hereinafterdescribed and claimed and illustrated in the accompanying drawings, inwhich F i gure l is a sectional elevation of so much of a percussivetool as will serve to illustrate the invention, and

Figure 2 is a side elevation of the handle.

Referring to the drawings the invention is shown embodied in apercussive tool of the coal pick type having a barrel A in which isdisposed a reciprocatory hammer piston B for deliverin blows on aworking implement (not shown).

On the rearward end of the barrel A is screwed a handle U in. thefrontend of the body portion l) ofwhich is formed a recess E consistingof an outer threaded portion F for engagement with threads G on the endof the barrel A and a rearward smooth annular portion which serves as avalve chest H. T he body portion D thus acts as a back head for thebarrel A and also serves toclamp a valve seat J located in the valvechamber H against the rearward end of the barrel A.

The rearward end of the valve seat J has two converging surfaces K onwhich is disposed a distributing valve L of the oscillatory flat platetype pivoted on a pin 0 anchored in the valve seat J. Inlet passages Pand Q leading to the rearward and front ends re-' .spectively of thebarrel are formed 1n the seat J and are controlled by the valve L.

Pressure fluid for actuating the tool may be conveyed from a suitablesource of supply (not shown) into a connection R which communicates atits inner end with a throttle valve chamber S formed in one slde of thebody portion D. The valve chamber S preferably lies in a planeparalleling the longitudinal axis of the tool and its rearward portion Tis in this instance reduced somewhat to form a valve seat U on which isseated a spring pressed throttle valveV. The throttle valve controls theadmission of pressure fluid fromthc valve chamber S into the reducedportion T from whence it may flow into the valve CllQShITl through apassage N which affords communication between the reduced portion, T ofthe valve chamber and the valve chest H.

In the present instance the throttle valve V is provided with a'stem Xguided by a rearwardly extending projection Y on the body portion D andextending with its free end beyond the rearward end of the saidprojection Y.

In accordance with the invention means are provided for unseating thethrottle valve V and also for guiding the tool with respect to the work.To this end a handle grip Z is pivoted on a pin Z extending through lugsF) on one side of the body portion D and the opposite or free end of thehandle grip Z terminates at a point in line with the projection Yvwherewith it is in slidable engagement by means of a pair of downwardlyextending walls 0 which form a slot (Z into which the end of theprojection Y'extends for'holding the free end of the handle grip againstlateral movement with respect to the body portion. Preferably aremovable wearing piece 0 is inserted in the handle grip Z to protectthe handle grip Z against such wear as is usually caused by the stem X.

In order that thehandle grip Z may be held against too free movementabout its pivotal point the said handle grip Z is provided with asurface f near its pivotal point to abut a surface 9 on the side of thebody portion D.

These surfaces 7 and g are so located that when the throttle valve isclosed only a slight space may exist between the rearward end of thestem X and the wearing piecee.

The present invention has been found tobe particularly desirable for usein connection with percussive tools of the coal pick type V I claim: a

A fluid actuated percussive tool, comprising a barrel, a reciprocatingpiston, a distributing valve at the rearward end of the barrel, a handlesecured to the barrel, said handle having a body portion forming theback head of the tool, a projection on the body portion extendingrearwardly of said body portion, a

7 spring pressed throttle valve in the body portion having a stemextending slidably through the projection and adapted to proj ect fromthe rearward end of the projection, a handle grip for the tool securedto and pivoted on only one end of the body portion and adapted to bepressed With its free end FRED M. SLATER.

